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Pension Plans - Additional Information (Detail) - Pension Benefits - USD ($) $ in Millions | 12 Months Ended
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May 31, 2018 | May 31, 2017 | May 31, 2016
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Average compensation with accrued benefits vesting period | 5 years |  |
Contribution to retirement plans in the next fiscal year | $ 52.8 |  |
Matching contribution charged to income | 18.7 | $ 17.4 | $ 16.3
Estimated benefits payable in the first year | 54.0 |  |
Estimated benefits payable in the second year | 58.4 |  |
Estimated benefits payable in the third year | 56.2 |  |
Estimated benefits payable in the fourth year | 59.1 |  |
Estimated benefits payable in the fifth year | 60.4 |  |
Estimated benefits payable in the years thereafter | 318.0 |  |
U.S. Plans |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Contribution to retirement plans in the next fiscal year | 1.3 |  |
Non-U.S. Plans |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Contribution to retirement plans in the next fiscal year | $ 8.1 |  |

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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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